Chapter 11, Lesson 8


11-8.A distinguish between direct and inverse with respect to proportions
Replace each __?__ with direct or inverse.
a.
If y increases when x decreases, then the quantities are in __?__ proportion.
b. If y decreases when x decreases, then the quantities are in __?__ proportion.

11-8.B write direct proportions
Write and solve a proportion.
If y is in direct proportion to x and y = 12 when x = 10, find y when x = 20.

11-8.C write inverse proportions
Write and solve a proportion.
If y is in indirect proportion to x and y = 12 when x = 10, find y when x = 20.